ellipsoid of wave normals

ellipsoid of wave normals

[ə′lip‚sȯid əv ¦wāv ′nȯr·məlz]
(optics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Assuming, without loss of generality, that eigenvalues of [??] are all positive, Cauchy's quadric becomes an ellipsoid, that is known in optics as ellipsoid of wave normals [13].